That’s it! Thank you!
Four lines of the file “hardware/arduino/mtk/cores/arduino/wiring_analog.c” were updated, like described here.
github.com/Seeed-Studio/Arduino … b4c2e11ebb
I edited these lines of this file inside my IDC folder and it works perfect now.
On the Xadow GSM Breakout are the ADC pins A2 and A3 declared. But belonging to FOUR definitions in wiring_analog.c there must be two more ADC.
By which pins can i connect to them?